1 Resource Allocation in Multimedia CDMA Communication Systems*

The future wireless communication systems are expected to support a broad range of multimedia services to mobile users with guaranteed quality-of-service (QoS). With the increasing demands for wireless services, the available frequency bandwidth of the systems is very limited and should be used efficiently. In this paper, we consider a wireless code-division multiple access (CDMA) system and develop an algorithm to allocate system resources to multimedia users for QoS provisioning and for high resource utilization. We propose a medium access control (MAC) protocol which exploits both time-division and code-division multiplexing. The MAC protocol uses fair packet loss sharing (FPLS) scheduling to guarantee the QoS requirements. The FPLS scheduler uses the information of traffic rate distribution and QoS requirements of the users to assign priorities to the users and determines an efficient accommodation of the packets in the time slots of each frame, so that the number of the served users is maximized under the QoS constraints. The resource utilization problem is formulated as an optimization problem. For practical solution, we propose the sub-optimal bin-packing approach for the single-cell system. Numerical results are presented to demonstrate the performance of the single-cell approach. Index Terms — code-division multiple access (CDMA), medium access control (MAC), multimedia traffic, packet scheduling, quality-of-service (QoS) provisioning